Exemple 13

In a random sample of six cell phones, the mean full retail price was $449 00 and the standard deviation was $206 00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean u Interpret the results Identify the margin of error (Round to one decimal place as needed.) Construct a 90% confidence interval for the population mean (Round to one decimal place as needed )